Preheat oven to 350°. Spread the white and wheat bread cubes in a single layer on a large baking sheet. Bake for 5 to 7 minutes in the preheated oven, or until evenly toasted. Transfer toasted bread cubes to a large bowl. In a large skillet, cook the sausage and onions over medium heat, stirring and breaking up the lumps until evenly browned. Add the celery, sage, rosemary and thyme; cook, stirring, for 2 minutes to blend flavors. Pour sausage mixture over bread in bowl. Mix in chopped apples, dried cranberries and parsley. Drizzle with turkey stock and melted butter and mix lightly. Spoon into turkey to loosely fill.